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What are different types of aerial photographs? Relate them to different land uses in aerial inventory.
PHOTOGRAPHY:
Photography, a method of picture making developed in the early 19th century, based on principles of light, optics, and chemistry. The word photography comes from Greek words and means “drawing with light.”
AERIAL PHOTOGRAPHS:
A photograph is a picture formed by the action of light on a base material coated with a sensitizing solution which is chemically treated to fix the image points at the desired density.
“Aerial photographs are photographs taken by a special camera on an airplane or aircraft”.
TYPES OF AERIAL PHOTOGRAPHS:
Aerial photographs are of two types:
1. Vertical: Vertical photographs are those which are taken with a camera pointed down vertical or as nearly vertical as possible (and camera axis horizontal) in an aircraft. (See vertical photograph of the satellite image of District Mastung).
Vertical photographs are used for land planning like town planning, or construction of roads for a city, etc.
2. Oblique: Oblique photographs are those which are taken with a camera pointed obliquely
(camera axis directed between horizontal and vertical). Oblique photographs are further
classified into two categories:
(camera axis directed between horizontal and vertical). Oblique photographs are further
classified into two categories:
- High oblique: High oblique are those photographs in which the horizon (place where earth meets sky) is visible. This is illustrated as: (Pretend the pic to be an aerial photo: here the horizon is visible_ a picture of PFI students from left: Mubbashir, Raja Asif, Abrar, Sarmad, Changazi, Lal Tahir, Nazir, Arshad, Sher Kurd, Sharaf Khan, Arifullah, and Ashfaq)
- Low oblique: Those photographs in which the horizon is not visible although its position can be recorded on the film by means of mirror attachment. This is illustrated as: (Here the horizon is not visible_ a picture of PFI students at mangroves: from left: Abrar Ahmed, Naeem Javid, Kamran Zarif, and Imran Shafee)
The term high and low does not refer to the elevation of the aircraft but they refer to the angel of the tilt of the photographs or the degree of deviation from the vertical.
Following figure illustrates the geometry of vertical, oblique, and horizontal photographs:
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NJMH is working as Deputy Conservator of Forests in Balochistan Forest & Wildlife Department (BFWD). He is the CEO of Tech Urdu (techurdu.net) Forestrypedia (forestrypedia.com), Majestic Pakistan (majesticpakistan.pk), All Pak Notifications (allpaknotifications.com), Essayspedia, etc & their YouTube Channels). He is an Environmentalist, Blogger, YouTuber, Developer & Vlogger.